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Groups > linux.debian.user > #200495

And yet another UEFI/BIOS question: Work on both.

From Wayne Sallee <Wayne@WayneSallee.com>
Newsgroups linux.debian.user
Subject And yet another UEFI/BIOS question: Work on both.
Date 2018-09-23 17:00 +0200
Message-ID <wBe1z-24L-11@gated-at.bofh.it> (permalink)
References (1 earlier) <wzSmt-3Bs-1@gated-at.bofh.it> <wA16p-eF-3@gated-at.bofh.it> <wAbSa-6CR-7@gated-at.bofh.it> <wAngC-4Xl-9@gated-at.bofh.it> <wAylH-32Y-3@gated-at.bofh.it>
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What do you recommend for setting up a system that will boot in either UEFI or BIOS mode, so if it is moved back and 
forth between UEFI and BIOS, it will boot every time?

Wayne Sallee
Wayne@WayneSallee.com
http://www.WayneSallee.com



On 09/21/2018 02:21 PM, Pascal Hambourg wrote:
> Le 21/09/2018 à 08:34, steve a écrit :
>> Le 20-09-2018, à 20:25:26 +0200, Pascal Hambourg a écrit :
>>
>>>>> You don't need to convert anything. UEFI can use DOS partition tables.
>>>>
>>>> I know since that's what I'm currently doing.
>>>
>>> Doing what ?
>>
>> Using msdos partition tables.
>
> This is irrelevant because until now you were booting Debian in legacy (BIOS) mode.
>
>>> I am not talking about you doing anything. I am saying that native UEFI boot (NOT legacy boot) can use a disk with a 
>>> DOS partition table, provided that it has an EFI system partition (Id 0xef).
>>
>> Isn't it ef00?
>
> No. ef00 is a gdisk specific mnemonic for the EFI system partition type identifier in a GPT partition table. The 
> actual GUID is C12A7328-F81F-11D2-BA4B-00A0C93EC93B.
> (0x)ef is the partition type identifier for an EFI system partition in a DOS partition table.
>
>> Because what I finally did is install a fresh Debian on another device
>> (using GPT) and the ACPI errors still were there.
>
> In legacy mode (with a BIOS boot partition) or EFI mode (with an EFI system partition) ?
>
>> I used the opportunity of having another Debian to convert my sda disk
>> to GPT tables, and change the BIOS setting to UEFI only (just for the
>> sake of it). So all my disk have a GPT partition table except for the 3
>> ones for the RAID1 array. Not sure whether I can use the same
>> manipulations to convert them to GPT also. But since they work fine, I
>> might leave it as it is.
>
> You can, but IMO it provides little value. GPT is useful in the following cases :
> - disk bigger that 2 TiB
> - more that 4 partition without the extended/logical partition kludge
> - need to use PARTLABEL or PARTUUD (but RAID uses its own UUID)
> - system disk for Windows in EFI mode
>
> AFAICS none of these conditions apply to your RAID disks. However I noticed that 2 out of the 3 RAID partition on each 
> disk are logical partitions. This is not necessary if there are only 3 partitions per disk. So in order to get rid of 
> the extended partition kludge, you could either convert the logical partitions into primary partitions or convert the 
> partition table to GPT.
>
>

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Thread

Yet another UEFI/BIOS question steve <dlist@bluewin.ch> - 2018-09-19 17:00 +0200
  Re: Yet another UEFI/BIOS question Darac Marjal <mailinglist@darac.org.uk> - 2018-09-19 17:30 +0200
    Re: Yet another UEFI/BIOS question steve <dlist@bluewin.ch> - 2018-09-19 18:00 +0200
  Re: Yet another UEFI/BIOS question Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-09-19 23:40 +0200
    Re: Yet another UEFI/BIOS question steve <dlist@bluewin.ch> - 2018-09-20 09:00 +0200
      Re: Yet another UEFI/BIOS question Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-09-20 20:30 +0200
        [SOLVED] Re: Yet another UEFI/BIOS question steve <dlist@bluewin.ch> - 2018-09-21 08:40 +0200
          Re: [SOLVED] Re: Yet another UEFI/BIOS question Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-09-21 20:30 +0200
            Re: [SOLVED] Re: Yet another UEFI/BIOS question steve <dlist@bluewin.ch> - 2018-09-22 07:00 +0200
              Re: [SOLVED] Re: Yet another UEFI/BIOS question Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-09-22 10:10 +0200
                Re: [SOLVED] Re: Yet another UEFI/BIOS question steve <dlist@bluewin.ch> - 2018-09-22 10:50 +0200
            And yet another UEFI/BIOS question: Work on both. Wayne Sallee <Wayne@WayneSallee.com> - 2018-09-23 17:00 +0200
              Re: And yet another UEFI/BIOS question: Work on both. Patrick Bartek <nemommxiv@gmail.com> - 2018-09-23 18:20 +0200
                Re: And yet another UEFI/BIOS question: Work on both. Wayne Sallee <Wayne@WayneSallee.com> - 2018-09-23 23:30 +0200
                Re: And yet another UEFI/BIOS question: Work on both. Patrick Bartek <nemommxiv@gmail.com> - 2018-09-24 03:00 +0200
                Re: And yet another UEFI/BIOS question: Work on both. David Wright <deblis@lionunicorn.co.uk> - 2018-09-24 21:20 +0200
                Re: And yet another UEFI/BIOS question: Work on both. Michael Stone <mstone@debian.org> - 2018-09-24 21:30 +0200
                Re: And yet another UEFI/BIOS question: Work on both. Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-09-27 15:10 +0200
              Re: And yet another UEFI/BIOS question: Work on both. David Wright <deblis@lionunicorn.co.uk> - 2018-09-23 20:40 +0200

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